Patient controlled drug delivery device
First Claim
1. A delivery device for patient-controlled infusion of a medicament, the delivery device comprising:
- (i) a reservoir for the medicament, which reduces in volume as medicament is withdrawn from the reservoir; and
(ii) a pump which has a predetermined delivery dose, wherein the pump comprises at least a first conduit which connects the reservoir to a pump chamber, a one-way valve in fluid communication with the first conduit and the pump chamber which permits medicament flow into the chamber but prevents reverse flow there from, a second conduit extending from the pump chamber and having a distal end through which the medicament may be released, and a controlling means in fluid communication with said pump chamber and said second conduit, wherein;
(a) the first conduit is a fine calibre tube, which is capable of restricting the filling time of the pump chamber to greater than 1 minute, and is suitably adapted to restrict the flow of medicament into the chamber to a predetermined maximum delivery rate;
(b) the controlling means;
(i) opens when pressure within the pump chamber exceeds a pre-selected minimum opening pressure, said opening pressure being greater than 760 mmHg;
(ii) is adapted to prevent the reverse flow of medicament and air into the pump chamber; and
(c) the second conduit is adapted to release the medicament in the form of a spray;
wherein after expulsion of medicament from the pump chamber a working interrelationship is formed between the fine calibre tubing and the controlling means to generate a lockout phase during which a patient is unable to effectively access a dose of medicament being drawn into the pump chamber until said chamber contains sufficient medicament to aid in treating said patient.
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Accused Products
Abstract
A delivery device for patient-controlled infusion of a medicament, the delivery device comprising a reservoir for the medicament and a pump having a predetermined delivery dose which is capable of displacing the medicament from the reservoir and delivering it to a patient, wherein the pump comprises a pumping means, a first conduit, capable of restricting flow rate, chosen in conjunction with the delivery dose of the pumping means to define a predetermined maximum dosage rate, said conduit connecting the reservoir to a pumping means, a one-way valve in fluid communication with the first conduit and the pumping means which permits medicament flow into the pumping means but prevents reverse flow, a controlling means, and a second conduit extending from the pumping means and having a distal end through which the medicament may be released, wherein the controlling means: (a) is in fluid communication with the pumping means and the second conduit; (b) opens when pressured within the dose chamber exceeds a predetermined minimum opening pressure for the controlling means; and, (c) is adapted to prevent the reverse flow of medicament and air into the pumping means.
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Citations
25 Claims
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1. A delivery device for patient-controlled infusion of a medicament, the delivery device comprising:
- (i) a reservoir for the medicament, which reduces in volume as medicament is withdrawn from the reservoir; and
(ii) a pump which has a predetermined delivery dose, wherein the pump comprises at least a first conduit which connects the reservoir to a pump chamber, a one-way valve in fluid communication with the first conduit and the pump chamber which permits medicament flow into the chamber but prevents reverse flow there from, a second conduit extending from the pump chamber and having a distal end through which the medicament may be released, and a controlling means in fluid communication with said pump chamber and said second conduit, wherein;
(a) the first conduit is a fine calibre tube, which is capable of restricting the filling time of the pump chamber to greater than 1 minute, and is suitably adapted to restrict the flow of medicament into the chamber to a predetermined maximum delivery rate;
(b) the controlling means;
(i) opens when pressure within the pump chamber exceeds a pre-selected minimum opening pressure, said opening pressure being greater than 760 mmHg;
(ii) is adapted to prevent the reverse flow of medicament and air into the pump chamber; and
(c) the second conduit is adapted to release the medicament in the form of a spray;
wherein after expulsion of medicament from the pump chamber a working interrelationship is formed between the fine calibre tubing and the controlling means to generate a lockout phase during which a patient is unable to effectively access a dose of medicament being drawn into the pump chamber until said chamber contains sufficient medicament to aid in treating said patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- (i) a reservoir for the medicament, which reduces in volume as medicament is withdrawn from the reservoir; and
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24. A delivery device for patient-controlled infusion of a medicament, the delivery device comprising:
- (i) at least a first and second reservoir for medicament storage; and
(ii) a pump which has a predetermined delivery dose, wherein the pump comprises a separate conduit feeding into each reservoir to connect said reservoir to the pump chamber, a one-way valve in fluid communication with each conduit extending from the reservoir and the pump chamber which permits medicament flow into the chamber but prevents reverse flow there from, a second conduit extending from the pump chamber and having a distal end through which the medicament may be released, and a controlling means in fluid communication with said pump chamber and said second conduit, wherein;
(a) Each conduit connecting the reservoir to the dose chamber is a fine calibre tube, which is capable of restricting the filling time of the pump chamber to greater than 1 minute, and is suitably adapted to restrict the flow of medicament into the chamber to a predetermined maximum delivery rate;
(b) the controlling means;
(i) opens when pressure within the pump chamber exceeds a pre-selected minimum opening pressure, said opening pressure being greater than 760 mmHg;
(ii) is adapted to prevent the reverse flow of medicament and air into the pump chamber; and
(c) the second conduit is adapted to release the medicament in the form of a spray;
wherein after expulsion of medicament from the pump chamber a working interrelationship is formed between the fine calibre tubing and the controlling means to generate a lockout phase during which a patient is unable to effectively access a dose of medicament being drawn into the pump chamber until said chamber contains sufficient medicament to aid in treating said patient.
- (i) at least a first and second reservoir for medicament storage; and
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25. A delivery device for patient-controlled infusion of a medicament, the delivery device comprising:
- (i) at least a first reservoir for medicament storage; and
(ii) a pump which has a predetermined delivery dose, wherein the pump comprises a conduit feeding from each reservoir to connect said reservoir to the pump chamber, a second conduit extending from the pump chamber and having a distal end through which the medicament may be released, and a controlling means in fluid communication with said pump chamber and said second conduit, wherein;
(a) Each conduit connecting the reservoir to the dose chamber is a fine calibre tube, which is capable of restricting the filling time of the pump chamber to greater than 1 minute, and is suitably adapted to restrict the flow of medicament into the chamber to a predetermined maximum delivery rate;
(b) the controlling means;
(i) opens when pressure within the pump chamber exceeds a pre-selected minimum opening pressure, said opening pressure being greater than 760 mmHg;
(i) is adapted to prevent the reverse flow of medicament and air into the pump chamber; and
(c) the second conduit is adapted to release the medicament in the form of a spray;
wherein after expulsion of medicament from the pump chamber a working interrelationship is formed between the fine calibre tubing and the controlling means to generate a lockout phase during which a patient is unable to effectively access a dose of medicament being drawn into the pump chamber until said chamber contains sufficient medicament to aid in treating said patient.
- (i) at least a first reservoir for medicament storage; and
Specification